Hi Jessica,
How wonderful that your Son is looking forward to seeing the Disney Characters during your next visit to Walt Disney World!
The only
Character Dining location where you will find Tigger is the Crystal Palace in the Magic Kingdom Theme Park and likewise, Chip and Dale can only be found at the Garden Grill Restaurant at Epcot Theme Park.
There are two Character Dining locations where you can normally find Pluto who also happens to be my Sons favourite Disney Character - The Best Friends Breakfast at Disney's Polynesian Resort and Chef Mickey's at Disney's Contemporary Resort.
As Character Dining is very popular, I would highly recommend that you make advance dining reservations for the meals of your choice at your earliest possible opportunity. Reservations can be made up to 180 days in advance on the Walt Disney World website or by calling (407) 939-3463.
Please do also remember that characters are always subject to change without notice.
It looks as though your question has been cut off so if you need to know anything else then please feel free to visit us again on the Moms Panel and ask me another question.
Wishing you a magical trip filled with memories which will last a lifetime!